Means for balancing g rinding-cylinders



(No'ModeL) B. S. ROY; MEANS FOR. BALANCING GRINDING CYLINDERS.

No. 540,925. P5 55555 June 11, 1895.

v a I Q xv ZZ/J f 6555 5.

' UNITED- STATES PATENT OFFICE.

BOZIL S. ROY, OF WORCESTER, MASSACHUSETTS.

MEANS FOR BALANCING GRINDING-CYLINDERS.

SPECIFICATION forming part of Letters Patent No. 540,925, dated June 11, 1895. Application filed April 25, 1892- Serial No.430,6l5. (No model.)

To all whom it may concern:

Be it known that I, BozIL- S. ROY, a citizen of the United States, residing at Worcester, in the county of Worcester andState of Massachusetts, have invented a new and useful Means for Balancing Grinding-Cylinders, &c., of which the following, together with the accompanying drawings, isaspecification sufliciently full, clear, and exact to enable persons skilled in the art to which this invention appertains to make and usethe same.

In the use of card-grinding cylinders, which are covered in the usual manner witha spirally wound fillet coated with glue and emery or similar comminuted material, it often be comes necessary 'to renew the covering or grinding surface by removing the worn out fillet and replacing it with a new coated fillet; andthis new fillet being generally heavier in some parts than others is quite liable to throw the cylinder out of balance so that it cannot be rotated at the required speed forsuccessful operation; hence-requiring the re-balancing of the cylinder which, with a cylinder of the usual construction is often a source of much delay, careful labor, and general annoyance; and in some instances requiring the removal and replacing of the fillets several times before attaining a successfully operative condition of the cylinder.

The object of my present invention is to obviate the above noted difficulty and to afford a' structure of peculiar adaptation for cylinders of the class named, wherein the balance can be readily effected, or changed as desired to accommodate the different conditions of the surface coverings; also, to provide a cylinder head having thereon a series of inwardly projecting bosses having chambers or pockets therein for receiving loose balls or weighting substances whereby the rotative balance of the cylinder is established and corrected in the manner, as more fully hereinafter explained.

In the drawings, Figure 1 is'a perspective View of a card-grinding cylinder embodying my improvement. Fig. 2 is a longitudinal section of the same, one head being shown in side View. Fig. 3 is a transverse section at line :0 as, Fig. 2; and Fig. 4. is an end view with one of the stoppers removed.

Referring to parts, a denotes the axial shaft,

In accordance with my improvement the cylinder-heads O are cast or formed each with a series of inwardly projecting chambered bosses or conoidal extensions 2, preferably three on each head, disposed wholly upon the inner side of the head-plate or disk and located between the main huband peripheral rim uniformly distant from'the shaft axis;

I said chambered bosses extending into the interior of the cylindrical drum substantially parallel with the axial shaft for a distance equal to or about one half the diameter of the cylinder, or for an ordinary sized card-grinderdrum to a distance of about three inches,- more or less, as illustrated, and screw-threaded stoppers 5 are provided for closing said open ings; the stoppers being accessible from the and D the driveend of the cylinder. The respective heads are best disposed in the cylinder so that their inwardly projecting chamber bosses on the opposite heads will stand at alternate radial positious, thus affording six positions within the circle. (See Figs. 3 and 4.) Lead balls or weighting substances 6 of various sizes, as re-' quired, for balancing the cylinder. are introduced into either of the chamber bosses, one i or more according to' the conditions in any particular case, until the correct balance for steady and fast revolution is effected. Cotton waste, loose fiber or other suitable pack-- ing 7 is then stuffed into thespace around the balls to confine them in place, and the threaded stoppers 5 are inserted thus securing the opening and forming the external finish. When it becomes necessary to re-coat or recover the cylinder by the fillet e being stripped ofi and replaced, the threaded stoppers 5 can be removed and the cotton waste drawn out, then by standing the cylinder on end the balls or weighting substances 6 fall out from the chamber openings. The cylinder can thenreadily be rebalanced by again introducing the balls where required to meet the ICQ requirements of the new covering, the operation being easily and quickly performed and the cylinder as recovered thus given a perfect balance so that it can be driven at the desired high degree of rotative speed with the same practical facility as with its original covering. By arranging the two heads in relation to each other within the cylinder, in the manner shown,with their inwardly projecting chambered bosses at alternate radial positions, the coated grinding cylinder can, by introducing the balls6 part at one end of the chambers and part at the other end, be balanced with the greatest accuracy, not only as regards its radial equipoise, but also in relation to its longitudinal eqnipoise; While the inward projection of the chambered bosses brings the poise well within the lengthot' the cylinderdrum and avoids any excrescences at the exterior ends of the drum.

The improved construction herein described may be successfully employed in cylinders of other kinds than for card grinding mechanism, and I desire to include such as within the scope of my invention.

I claim as my invention herein, to be secured by Letters Patent-- 1. A rotatable cylinder or drum, having a head provided with a plurality of pockets located between its axis and its periphery, each of said pockets being provided with means whereby balancing weights may be readily inserted and removed, substantially as described.

2. In a rotatable cylinder, a cylinder head having a plurality of inwardly projecting hollow bosses, located between its axis and periphery, each having an opening for the insertion and removing of suitable balancing weights and means for closing said openings, substantially as described.

3. A rotatable cylinder, having a head at each end, provided with aplurality of hollow bosses located between the cylinder periphery and axis, those at one end alternating in radial position with those at the other, and each provided with an opening and a removable stopper, whereby balancing weights may be readily inserted and removed, substantially as described.

Witness my hand this 18th day of April, A. D. 1892.

BOZIL S. ROY

Witnesses:

CI-IS. H. BURLEIGH, ELLA P. BLENUs. 

